A portable mud mixing system for adding wet or dry components to oilfield drilling mud provides an enclosed mobile platform including at least one mud mixing hopper, at least one mud mixing tank, a suction piping assembly and a discharge piping assembly which blend the additives within the circulating drilling mud into a homogeneous mixture, circulate the mixture, and provide for introduction of the mixture into production, the system providing transfer of the drilling mud and mixture from pre-mix to production in one singular integrated system.